Netduino iTunes HID Control

using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;
using Netduino_USB_HID_Library;

namespace iTunesHIDRemote
{
    public class Program
    {
        private static readonly InterruptPort LeftButton = new InterruptPort(Pins.GPIO_PIN_D2, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
        private static DateTime _leftButtonLastPress = DateTime.Now;
        private static readonly InterruptPort CenterButton = new InterruptPort(Pins.GPIO_PIN_D3, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
        private static DateTime _centerButtonLastPress = DateTime.Now;
        private static readonly InterruptPort RightButton = new InterruptPort(Pins.GPIO_PIN_D4, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
        private static DateTime _rightButtonLastPress = DateTime.Now;

        private static readonly AnalogInput Pot = new AnalogInput(Pins.GPIO_PIN_A0);
        private static double _potLastValue;
        private const int PotTolerance = 10;

        private static int PotMax = 1023;
        private static int PotMin = 80;

        public static void Main()
        {
            LeftButton.OnInterrupt += leftButton_OnInterrupt;
            CenterButton.OnInterrupt += centerButton_OnInterrupt;
            RightButton.OnInterrupt += rightButton_OnInterrupt;

            string setupResult = Keyboard.SetUp();
            if (setupResult != "Success")
                return;

            int value, range;
            float inc;

            while(true)
            {
                value = Pot.Read();

                if (CalculateChangeInPotValue(value))
                {
                    Debug.Print("Volume: " + value);

                    if (value > PotMax)
                        PotMax = value;
                    if (value < PotMin)
                        PotMin = value;

                    _potLastValue = value;

                    range = PotMax - PotMin;
                    inc = range/9;

                    if (value < inc * 1)
                        Keyboard.Send(16);
                    if (value > inc * 1 && value < inc * 2)
                        Keyboard.Send(17);
                    if (value > inc * 2 && value < inc * 3)
                        Keyboard.Send(18);
                    if (value > inc * 3 && value < inc * 4)
                        Keyboard.Send(19);
                    if (value > inc * 4 && value < inc * 5)
                        Keyboard.Send(20);
                    if (value > inc * 5 && value < inc * 6)
                        Keyboard.Send(21);
                    if (value > inc * 6 && value < inc * 7)
                        Keyboard.Send(22);
                    if (value > inc * 7 && value < inc * 8)
                        Keyboard.Send(23);
                    if (value > inc * 8)
                        Keyboard.Send(24);



                }
                Thread.Sleep(25);
            }
        }

        static bool CalculateChangeInPotValue(int value)
        {
            return _potLastValue - PotTolerance > value || _potLastValue + PotTolerance < value;
        }

        static void rightButton_OnInterrupt(uint data1, uint data2, DateTime time)
        {
            if ((DateTime.Now - _rightButtonLastPress).Milliseconds < 100)
                return;
            Debug.Print("Next Song");
            Keyboard.Send(13);
            _rightButtonLastPress = DateTime.Now;
        }

        static void centerButton_OnInterrupt(uint data1, uint data2, DateTime time)
        {
            if ((DateTime.Now - _centerButtonLastPress).Milliseconds < 100)
                return;
            Debug.Print("Play/Pause");
            Keyboard.Send(14);
            _centerButtonLastPress = DateTime.Now;
        }

        static void leftButton_OnInterrupt(uint data1, uint data2, DateTime time)
        {
            if ((DateTime.Now - _leftButtonLastPress).Milliseconds < 100)
                return;
            Debug.Print("Previous Song");
            Keyboard.Send(15);
            _leftButtonLastPress = DateTime.Now;
        }

    }
}